Classification of intestinal vascular malformations is divided into three categories based on arteriographic features, region of distribution, age of onset, and family history: Type l: Acquired vascular malformations. The lesions are confined, preferably in the right hemicolon, age >55 years, and are most often associated with hypertension and portal hypertension. Type II: congenital arteriovenous malformation. Prevalent in young people. The lesion is diffuse and can be located in any part of the intestine. Type III: hereditary capillary dilatation, less common, can be located in any part of the gastrointestinal tract, accompanied by skin capillary dilatation. Reliable diagnostic methods for intestinal vascular malformations are colonoscopy and angiography. The diagnostic rate of angiographic diagnosis is 42% to 86%. Treatment: for small lesions with little bleeding, vasoconstrictor and hemostatic agents can be dripped through the angiographic catheter. The effective rate reaches 92%, but 21% of patients bleed again. This method can be used repeatedly, but it is traumatic and has some risks. 2, transcolonoscopic treatment, colonoscopic hemostasis has the advantages of safety, effectiveness, repeated multiple times. The bleeding point is small with electrocoagulation hemostasis. Larger lesions are hemostatized by laser method.